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ebpf: migrate bpf_prog's flags to bitfield

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As we need to add further flags to the bpf_prog structure, lets migrate
both bools to a bitfield representation. The size of the base structure
(excluding insns) remains unchanged at 40 bytes.

Add also tags for the kmemchecker, so that it doesn't throw false
positives. Even in case gcc would generate suboptimal code, it's not
being accessed in performance critical paths.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann
2015-09-30 01:41:50 +02:00
committed by David S. Miller
parent bd8762bec9
commit a91263d520
11 changed files with 18 additions and 12 deletions
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6
include/linux/filter.h
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@@ -326,8 +326,10 @@ struct bpf_binary_header {
struct bpf_prog {
u16 pages; /* Number of allocated pages */
bool jited; /* Is our filter JIT'ed? */
bool gpl_compatible; /* Is our filter GPL compatible? */
kmemcheck_bitfield_begin(meta);
u16 jited:1, /* Is our filter JIT'ed? */
gpl_compatible:1; /* Is filter GPL compatible? */
kmemcheck_bitfield_end(meta);
u32 len; /* Number of filter blocks */
enum bpf_prog_type type; /* Type of BPF program */
struct bpf_prog_aux *aux; /* Auxiliary fields */